Murzin is creatively searching for counterchances, and they can only be related to the white king's delicate position.
25. c3c4 Now Black is facing serious problems. 25... f6f5  26. c4c5 A very strong idea. Not only is the black bishop completely excluded from the game, but Praggnanandhaa gets access to a vital open file. 26... b6a5  27. c1b1 